Air vent and pump



(No Model.) I

J. F. DAVIS.

AIR VENT AND PUMP. N0. 339,384. Patented Apr. 6, 1886.

621 JZIL Z I M 0 a a W/ ca n UNirnn- SQATES PATliNT @riucn.

JAMES F. DAVIS, OF INDIAXAPOLIS, lXDL-XNA.

AlR VENT AND PUMP.

SPECIPECAI'ION forming part of Letters Patent No. 339,384, dated April 6, 1886.

Application filed December 14. 1885. Serial No. 185,647. (No model.)

To aZZ whom it may concern.-

Be it known that I, James F. DAVIS, a resident of Indianapolis, Marion county, Indiana, have made certain new and useful Improve ments in Air Pumps and Vents, a description of which is set forth in the following specification, reference being made to the accompanying drawings, in the several figures of which like letters indicate like parts.

My invention consists in constructing the plunger of an air-pump so as to provide means within the cylinder for venting the cask or keg to which the apparatus is attached by a slight movement of the piston-rod, and will be understood from the following description.

in the drawings, Figure 1 represents a 1011- gitudinal section of my device, with the noz zle attached for connection with the keg containing the fermenting liquid. Fig. 2 represents an end view of the plunger and rod, showing the holes in the plunger through which the air is permitted to escape. Fig. 3 is an inside view of the upper cap of the cylinder, showing the openings to admit the entrance or escape of air. Fig. 4c is a detailed view of the lower part of the piston-rod, the plunger, the leather washer, and the nut for securing the parts upon the rod. 4

In detail, 0 is the cylinder of the ainpump, having a cap, act,- on its other end, through which is a central opening to admit the rod 1', and smaller openings, a, to permit the air to enter or escape when desired. The rod 1* has a collar, 0, formed integral with the rod, near the end, as shown in Fig. 1, and below this collar the rod is made of less diameter and passes through the plunger p, the latter fitting loosely on this end of the rod. an is a nut, which works upon the threaded end of the rod r, and is stopped by a shoulder at the bottom of the thread. This construction, it will be observed, permits the rod 1' to be drawn upward a slight distance, so as to leave a space intervening between the collar 0 and the plunger 19, and by pushing down upon the handle of this rod the collar 0 is brought down close upon the top of the plunger, closing the small openings which are bored in the plunger, as shown in Fig. 3, to admit the escape of air. on is a cap formed on the lower end of the aircylinder, and a projection on the other side of this cap is threaded to receive a screw-collar, which fits closely thereon. This screw-collar is also threaded on the outside to enter the threaded opening in the end of the nozzle n, which is right-angled in shape, the opposite end being formed tapering, to permit its being driven into an opening in the bung of the keg. \Vhen this has been tightly inserted into the hung of the keg, if it is des red to increase the pressure upon the liquid within the keg, it is easily done by means of the plunger of the airpump, and it is noticeable that when the plunger of the air-pump is forced down, driving the air before it through the nozzle into the keg and upon the liquid, the collar 0 closes down upon the top of the plunger 19, stopping the small air-holes a, and preventing the air from escaping. If it is now desired to vent the keg, all that is necessary is to draw the rod r, by means of the handleh, outashort distance, sufficient to remove the collar 0 from the top of the plunger p, bringing the not an down upon and against the opposite end of the plunger When this is done, the parts take the position indicated in Fig. l. \Vhen the keg has been suificiently vented, all that is necessary to do is to push back the rod r, so that the collar 0 rests against the top of the plunger, as shown in Fig. 4, thus closing the air-vents a, and forbidding the escape of either air or gas from the keg.

I am aware that the use of air-pumps in connection with nozzles of the kind herein mentioned is not new, and do not broadly claim the same as my invention; but I am not aware that any device for venting the keg through openings in the plunger and closing the same by means of'a slight pressure of the rod has been known or used before my invention.

\V hat I claim, and desire to secure by Letters Patent, is the following:

1. The air-pump composed of the cylinder 0 with upper and lower caps, and the rod-r, pro vided with the collar 0, for closing the openings a in the plunger, its lower end passing through the plunger, which tits loosely thereon, allowing the free movement through the plunger of the lower end of such rod, all com bined substantially as described.

2. The air-pump composed of the cylinder 0, having upper and lower caps, and having apiston-rod which passes through the plunger, I keg containing the fermenting liquid, all com- 10 the latter fitting loosely upon the lower end of bi ned substantially as described.

such rod and provided with air holes to ad- I In witness whereofI have hereto set my hand mit the passage of air in either direction. the this 14th of November, 1885.

rod provided with a flange or collar which T closes the air-holes in the plunger when the JAMES rod is pressed downward upon it, and the 1102- Witnesses: zle n, adapted to be secured to the lower end 0. P. JACOBS,

of the air-pump and to be connected with the HATTIE MURRY. 

